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For example, GW-GM corresponds to "well-graded gravel with silt." If the soil has more than 15% by weight retained on a #4 sieve (R #4 > 15%), there is a significant amount of gravel, and the suffix "with gravel" may be added to the group name, but the group symbol does not change. For example, SP-SM could refer to "poorly graded SAND with silt ...
USDA soil taxonomy (ST) developed by the United States Department of Agriculture and the National Cooperative Soil Survey provides an elaborate classification of soil types according to several parameters (most commonly their properties) and in several levels: Order, Suborder, Great Group, Subgroup, Family, and Series.
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The United States Department of Agriculture (USDA) is an executive department of the United States federal government that aims to meet the needs of commercial farming and livestock food production, promotes agricultural trade and production, works to assure food safety, protects natural resources, fosters rural communities and works to end hunger in the United States and internationally.
The Under Secretary of Agriculture for Natural Resources and Environment, or USA(NRE), is a high-ranking official in the United States Department of Agriculture and the principal advisor to the United States Secretary of Agriculture on policy to promote the conservation and sustainable use of the Nation's natural resources.
The U.S. Dietary Guidelines provide "advice on what to eat and drink to meet nutrient needs, promote health, and prevent disease," the United States Department of Agriculture (USDA) explains.
An injection well is a device that places fluid deep underground into porous rock formations, such as sandstone or limestone, or into or below the shallow soil layer. The fluid may be water , wastewater , brine (salt water), or water mixed with industrial chemical waste.
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